Abrading shaft mounting



ZMZUJS? Nov. 5, 1935.

4 Sheets-Sheet 1 Filed March 19, 1934 Inventor 7 lldmey H. L. MYERSABRADING SHAFT MOUNT ING Nwv. 5, 1935.

Filed March 19, 19,54 4 Sheets-Sheet 2 Nov. 5, 1935. H. L. MYERSABRADING SHAFT MOUNTING 4 Sheets-Sheet 3 FiledMarch 19, 1934 Inventorflllomey Nov. 5, 1935. v H. 1.. MYERS 2,020,157

'ABRADING SHAFT MOUNTING 7 Filed March 19, 1954 4 Sheets-Sheet 4 Inbentor 29ers BJQMMIM.

Patented Nov. 5, 1935 UNITED STATES PATENT OFFICE 'ABRADING SHAFTMOUNTING Harry L. Myers, Toledo, Ohio, assignor to The American FloorSurfacing Machine Company,

Toledo, Ohio -Application 'March 19,

12 Claims. 1

This invention relates to the surfacing industry and has reference to anovel structural assemblage expressly designed to be embodied in alightweight portable sanding machine of the electric motor operated typenow well known in the trade as the American Light Weight Floor Sander.This invention contains subject matter common to my pending applicationSerial Number 754,872

filed November 26, 1934.

By way of introduction and explanation his to be pointed out that amachine of the aforesaid. variety is illustrated in one of my priorpatents entitled Light weight surfacing machine and identified under'No.1,934,814 of November 14, 1933. The type of machine disclosed in thispatcut, as Well as in the drawings of the accompanying applicationembodies a portable wheeled supported frame which, among other parts,constitutesa support for an electric motor and a motor 1 driven sandingdrum. Although the drum is not detailed in the patent just mentioned itis to be pointed out in actual practice this drum is in the nature of ametal rubber covered cylinder formed with a slot into which the freeends of a'strip of sandpaper or abrasive strip are tucked and heldbetween manually regulated adjustable;

clamping means.

Despite efiorts to develop a sanding drum which will insure a smootheven finish on the surface, it

has been discovered that the presence of the gap produced by theclamping slot is such as to materially alter the efficiency andaccomplishment of the desired uniform surface conditioning results. Thisis caused by the break in the abrading surface and also by reason of thefact that the Wood dust accumulates in the pocket formed by this gap,sometimes causing jumping which is slipped over the drum and securelyheldthereon, whereby to promote greater efficiency and more satisfactoryabrading and finishing results.

In addition to the particular construction of the drum itself, thenovelty, as will hereinafterbe described, is predicated upon'certainrefinements and structural distinctions embodied in the or The use of a1934, Serial No. 716,409

frame construction, especially the bearing means for the shaft whichcarries the abrading drum.

As will be reflected from the succeeding description structural noveltyis predicated upon the quick change abradant drum idea together 5 withthe particular frame construction, especially wherein the drumsupporting shaft has a rigid bearing on one side and self-adjusting andcompensating bearing on the other side associated with a swingable partof the frame which permits 10 access to be had to one end of the drumfor exchanging the abrading sleeve.

Other structural distinctions and details upon which added novelty isbased will become more explicitly apparent from the following descrip-15 tion and drawings.

In the accompanying drawings wherein like numerals are employed todesignate like parts throughout the same:

Figure 1 is a side elevational view of the aforementioned light weightrotary drum floor sanding machine perfected in accordance with theprinciples of the present invention.

Figure 2 is a top plan view of the frontal portion of the framestructure, with certain parts removed for clearness of illustrationofthe main features of the invention.

Figure 3 is a sectional view taken on the plane of the irregular line 33of Figure 1.

Figure 4 is'a section on the line 4-4 of Figure 2.

Figure 5 is a sectional View showing the swingable section of the sideflange or so-called cover plate swung out to open position.

Figure 6 is a view in section and elevation of the rubber cylinder whichconstitutes the covering for the improved drum.

Figure '7 is an enlarged fragmentary elevational view detailing theretaining catch or latch feature. I

Figure 8 is a perspective view of the keeper or wear plate for thelatch.

Figure 9 is a sectional view of the adjustable housing for theself-adjusting or compensating bearing. 45

Figure 10 is an elevational view of Figure 9 observing it in a directionfrom right to left.

Figure 11 is an enlarged detail section on the line ll-ll of Figure 4.

Figure 12 is a detail View showing the left hand 50 endportion of thedrum structure illustrated in Figure 3 and showing the spring in thebearing housing expanding and shoving said housing to' the left.

Figure 13 is a detail perspective view of the type of sanding orabrading sleeve utilized on the new drum.

Referring now to Figure l of the drawings it will be seen that theone-piece aluminum frame 5 of the typical or conventional light weightsanding machine previously mentioned (Patent No. 1,934,814) is denotedby the numeral l5, this being provided with a swivelling caster l6 atthe rear, steering handle 11, electric motor l8, drum 10 raising andlowering wheel I9, a belt drive 28 from the motor to the power receivingpulley 2| (see Figure 2) on the fixed end of the sanding or abradingdrum 22. Other parts of the machine are shown but are of no consequenceso far as the novelty of this invention is concerned.

Therefore they will not be described. The remaining description will beconfined to the construction of the drum and its mounting. As shown inFigure 1 the frontal portion of one side flange of the frame is formedinto what maybe designated as a swingable bearing stabilizing and drumcover plate 23, this being hingedly mounted to swing outwardly asindicated at 24. As shown in Figure 5 this plate is provided with anaperture 25 in which is fitted an adapter ring 26 of a beveled type toaccommodate the correspondingly beveled bearing housing or cup 21. Thiscup is slidably mounted 'on a bushing 28 (see Figure 12) through theinstrumentality of 30 a retaining washer 30, said bushing being carriedby the rotary drum shaft 29. This housing 21 is adapted to accommodate aball hearing assembly unit 3| permanently attached to one end of theshaft 29, wherein the bearing assembly ;;serves as a stop to limit theoutward sliding move- .ment of the housing 21 in a direction from rightto left, and wherein the flange on the bushing 28 limits the slidingmovement in-the opposite direction. The opposite end of the shaft 29 ismount- ;ed in a suitable rigid or permanent bearing 32 carried by thedepending side flange 33;as shown in Figure 3. Thus, it will be seenthat the drum carrying shaft is rigidlysupported in a bearing at one endand provided with a belt driven pulley and that the opposite-end isequipped with a sliding cup-like housing for the permanently attachedbearing assembly 3|, thishousing being adapted for compensating andadjustable reception in an adapter ring 26 carried by the hingedly..mounted cover plate 23. For the purpose of insuring proper associationof these parts it will be observed that'a coil spring 34 is-arranged inthe housing as shown in Figures 3 and 12. Thus when the plate 23 isswung outwardly as shown ..in Figure 5 spring 34 expands and shoves thebearing housing to the left. When the plate is closed the bearinghousing is moved in the opposite direction and the spring is compressedto insure tight fitting of the housing in the adapter ring 26. Thisprovides the requisite double bearing support for the shaft 29.

To add to the dependability and 'efliciency ofthis arrangement it isnecessary to provide means for keeping the plate 23 effectively closed,that is, against swinging outwardly from the frame.

This means is described as a latch or catch arrangement and isillustrated in Figures 3 and 11 in particular. Directing attention toFigure 11 it will be observed that the plate 23 is provided with adepression 35 having an opening 36 to accommodate the latch 31. Thislatch is adapted to releasably engage a wearer keeper plate 38 mountedin the depression, the latch being carried by a swingable arm ormounting 39 pivoted .between its ends on a pin 40 carried by a hangerbracket 4| depending from the under side of the top of the frame asshown in Figure 3-. The free or inner end of the arm 42 is provided witha set screw 43 engageable with a stop device 44 also carried by theframe. cluded in this arrangement which presses against the latchcarrying arm and forces the latch againts its keeper plate. The idea ofa pivotal mounting and the set screw is to prevent the latch fromswinging, under the action of the 10 spring 45, to a position to make itinaccessible for latching purposes. In other words it is desired to keepthe latch in such a position as to allow it to be easily pried open andthereafter to position it sothat when the plate is swung closed 15 thelatch will automatically snap over the keeper plate 38. It will be notedthat the keeper plate is formed with a clearance or tool notch 46 so asto permit a tool to be placed behind the nose of the latchto pry itopen. 20

I next call attention to the particular con- .struction of the sandingor abrading drum. As

before statedthis is of a radially expansible and contractible type andis adapted to accommodate the spirally Wrapped or manufactured endless25 abrading sleeve 60 shown in Figure 13. In order to accomplish thisresult the type of drum shown particularly in Figure 3 has been foundsatisfactory.

This drum comprises a relatively fixed conical 30 expander or hub unit41 and a companion unit 48. The unit 41 is fixedly keyed on the shaftand the unit 48 slidably mounted. A coil spring surrounds the shaft asindicated at 49 and is located between these two units 41 and 48 topress 35 the unit 48 in a direction toward the right when the retainingand clamping nut 59 is released. This nut is mounted on threads 5!formed on the shaft. The nutis provided with sockets to accommodate aspanner wrench (not shown). v

It will be noticed that the clamping nut is located adjacent the fixedbearing supported end of the shaft, that is adjacent to the fixed flange33 of the frame. The rubber covering or cylinder shown in Figure 6 isdifferentiated by the 45 I numeral-52 and, it will be observed, hasconverging conical or beveled surfaces 47a and 48a. cooperating with thetwo converging conical expanders or units 41 and 48 respectively. Thusas these parts are spread-apart the inherent re- 50 siliency of thecylinder 52 causes it to contract so as to permit the sleeve 41 to beslipped on. Then the nut 50 is again tightened to expand the cylinderand hold the sleeve in place.

The gist of the invention is found primarily in 55 v;

the provision of a. frame, a shaft mounted at least in a bearing at oneend, an expansible and contractible rubber cylinder equipped drum and anendless abrading sleeve adapted to be slipped over said drum in a mannerto permit said sleeve 60 i to be easily applied and thereafter securelymaintained in place. This is one'feature of the invention. Secondly thepreferred arrangement embodies a double bearing arrangement for theshaft 29 wherein one bearing 32 is fixed and the 65 operation. 75 iThere is a spring 45 in- 5 It is understood, of course, that the drum,when it is sufiiciently small, can be supported solely at one end. Inother words the double bearing arrangement is not essential'under allconditions.

i In'alarge floor sanding machine .of the type the invention isapplicable to mandrels as well as to so-called abrading and surfacingdrums.

Not only this the invention has numerous other commercial features whichneed not be emphasized in this technical and explanatory descrip-.l-lclaim as new is:'

1. In a structure of the class described, a frame including a fixedbearing, a shaft mounted for rotation in said bearing, said shaft beingprovided at the opposite end with a fixedly attached bearing, a slidablespring pressed housing on the last named end of the shaft associatedwith said last mentioned bearing, said frame including a hinged coverplate having an aperture to accommodate said housing, a beveled adapterring surrounding said housing, and a sanding drum mounted on said shaft.

2. In a structure of the class described, a frame including a fixedbearing, a shaft mounted for rotation in said bearing, said shaft beingprovided at the opposite end with a fixedly attached bearing, a slidablespring pressed housing'on the last named end of the shaft associatedwith said last mentioned bearing, said frame including a hinged coverplate having an aperture to accommodate said housing, a beveled adapterring surrounding said housing, and a sanding drum mounted on said shaft,and a spring pressed manually releasable latch mounted on the frame,said hinged plate being provided with a keeper plate with which saidlatch is engageable.

3. In a structure of the class described, comprising a wheeled framecarrying a bearing, a single shaft mounted for rotation in said bearing,said shaft being provided at the opposite end with another bearing, ayielding bearing housing associated with the latter bearing, said frameincluding a movable cover plate having means thereon to support saidbearing housing, and a sanding drum mounted on said shaft.

4. In a structure of the class described, comprising a wheeled framecarrying a bearing, a single shaft mounted for rotation in said bearing,said shaft beingprovided at the opposite end with another bearing, ayielding bearing housing associated with the latter bearing, a removablesanding sleeve carried by the shaft, a movable cover plate carried bythe frame, said cover plate permitting the replacement of said sandingsleeve when in one position and constituting a support for the yieldingbearing housing when in another position.

5. In a structure of the class described comprising a wheeled framecarrying a bearing, a single shaft mounted for rotation in said hearing,said shaft provided at its opposite end with another bearing, a yieldingbearing housing associated with the latter bearing, a yielding sandingdrum carried by said shaft, a removable abrading sleeve mounted on thedrum, a swinging cover.

plate mounted on the frame, said plate having a support for saidyielding housing, said cover plate permitting replacement of saidabrading sleeve when in open position and providing the support for theyielding housing when in the closed. position.

6. In astructure of the class described comprising a wheeled framecarrying a bearing, a single shaft mounted for rotation in said bearing,said shaft provided at its opposite end with another bearing, a yieldingbearing housing asso- 5 ciated with the latter bearing, a yieldingsanding drum carried by said shaft, a removable abrading sleeve mountedon the drum, a swinging cover plate mounted on the frame, said platehaving a support for said yielding housing, said cover plate permittingreplacement of said abrading sleeve when in open position and providingthe support for the yielding housing when in closed position, and alatching mechanism carried by the frame and the swinging cover to securethe latter in closed position.

7. In a structure of the class described comprising a wheeled frame,said frame including a top wall and side flanges adapted for shielding asubstantial portion of a floor surfacing member, 2 a bearing fixed inone of the side flanges, a single shaft rotatably mounted at one end insaid bearing, said shaft carrying a bearing at the other end thereof, ayielding bearing housing associated with the last mentioned bearing, aremovable floor surfacing member carried by the shaft, a certain area ofthe other of said guide flanges formed with a movable section, saidmovable section carrying a support engageable with the yielding housingwhen in one position and allowing the floor surfacing member to beremoved when in another position.

8. In a structure of the class described comprising a wheeled frame,said frame including a top wall and side flanges adapted for shielding asubstantial portion of the floor surfacing member, a bearing fixed inone of the side flanges, a single shaft rotatably mounted at one end insaid bearing, said shaft carrying a hearing at e the other end thereof,a yielding bearing housing associated with the last mentioned bearing, aremovable floor surfacing member carried by the shaft, a certain area ofthe other of said side flanges formed with a hinged section, said hingedsection carrying a support engageable with the yielding housing when inthe closed position and allowing the floor surfacing member to beremoved when in the open position.

9. In a structure of the class described comprising a wheeled frame,said frame including a top wall and side flanges adapted for shielding asubstantial portion of the floor surfacing member, a bearing fixed inone of the side flanges,

a single shaft rotatably mounted at one end in said bearing, said shaftcarrying a bearing at the other end thereof, a yielding bearing housingassociated with the last mentioned bearing, a removable floor surfacingmember carried by the shaft, a certain area of the other of said sideflanges formed with a hinged section, said hinged section carrying asupport engageable with the yielding housing when in the closed positionand allowing the floor surfacing member to be removed when in the openposition, a latch carried by the frame, and means on the hinged sectioncooperating with the latch for releasably locking'the hinged section inclosed position for supporting the yielding bearing housing. 7

10. As a component part of a structural assemblage of the classdescribed, an abrading drum including a shaft provided at one end with arelatively fixed bearing and an associated bushing, a tapered cup-likebearing holder slidably mounted on said bearing and including aseparable retention washer slidable on said bushing and movable towardand from said bearing, and a compressed coiled thrust spring containedin said cup-like holder and bearing at one end against said bearing, inthe'manner and for the purposes described.

11. In a structural assemblage of the class described, a portable frameincluding an abrading drum and a pivotally mounted member swingabletoward and from one end of the drum, said one end of the drum beingprovided with a shaft, and said member being provided with an adapteropening registerable with said shaft, a bearing associated with saidshaft, and a spring-pressed holder and support for the bearing slidablyring, and a bearing accommodation and supporting unit of aspring-pressed extensible and retractable type slidably mounted on saidbearing and slidably disposed in said adapter ring.

HARRY L. MYERS.

